Related Clues:

• See 10-Across
• ID digits
• PC key
• 3.9, e.g.
• Phi Beta Kappa concern, for short
• Application datum: Abbr.
• Bank acct. datum
• 1040 ID
• Valedictorian's pride: Abbr.
• Application info: Abbr.
• W-2 info
• 3.0, e.g.
• 2.5, e.g.
• It's used for ID in the U.S.
• Nine-digit ID